Tutorials covering programming languages, type systems, architecture, tooling, and the patterns used to build software that lasts. Each chapter is standalone, built around real examples and verified facts.
React re-renders a component when its state changes, when its props change, or when its parent re-renders. The third case is the one that surprises developers. A parent re-renders because of its own state change, and every child re-renders with it, even the children whose props have not changed. For a small component tree, this…
Rust treats testing as a first-class part of the language. The cargo test command is built into the toolchain, the test functions are ordinary functions annotated with the #[test] attribute, and the test module is the ordinary module with the #[cfg(test)] attribute. There is no separate test framework to install, no configuration file to write,…
A subquery can return a value, a list of values, or a set of rows. The EXISTS operator is different from all of these. It does not return a value. It returns a boolean: true if the subquery produces at least one row, false if it produces none. This distinction matters because EXISTS is not…
Tailwind’s preflight resets every browser default. The headings lose their sizes, the paragraphs lose their margins, and the lists lose their markers. This is intentional: the reset gives the developer a blank canvas, and the utility classes paint the styles. But when the content comes from a Markdown file, a CMS, or a rich-text editor,…
At some point TypeScript stops feeling like a language for describing JavaScript and starts feeling like a language in its own right — one that runs at compile time, manipulates types instead of values, and produces errors instead of output. This is type-level programming: using the type system as a computational substrate. Conditional types are…
A template usually names its components. <UserCard /> renders a UserCard, and that is the end of the story. But a tabbed interface does not know which panel to render until the user picks a tab. A plugin system loads components the application has never heard of. A wizard renders one step at a time…
Signals are Angular’s reactive primitive. A signal is a value that notifies its consumers when it changes, and a component that reads a signal is marked for change detection when the signal changes. The API is small — signal, computed, and effect are the three functions — but the model they implement is the foundation…
These three properties unlock the third dimension in CSS. With perspective, rotate3d, and transform-style, you can create stunning 3D effects like cubes, cards, and spatial interfaces. Overview of Features Property/Function Description Values perspective Distance from viewer to z=0 plane Length (e.g., 600px) rotate() 2D rotation around a fixed point Angle (e.g., 45deg) rotate3d() 3D rotation…
JSON is the wire format of the modern web. The REST APIs return it, the configuration files store it, the WebSocket messages carry it, and the local storage persists it. The dart:convert library is the built-in codec for the JSON, and it provides the two functions: the jsonEncode and the jsonDecode. The jsonEncode takes the…
A single container’s logs are accessible with docker logs. A hundred containers across ten hosts are not. The logs are scattered across the machines, and the search requires the SSH into each one. The centralized log aggregation solves the problem: the container logs are shipped to a central system, indexed, and searchable from the single…